12 letters
- sycophantism26
- symmetallism25
- synchronisms24
- syndactylism25
- syndicalisms23
- systematisms20
- tautomerisms19
- teetotalisms16
- theocentrism21
- transvestism20
- triumphalism25
- ultraleftism21
- ultrarealism18
- unitarianism18
- universalism22
- uricotelisms20
- vagabondisms26
- vaginismuses23
- vanguardisms24
- vigilantisms23
- voluntarisms22
- voluntaryism24
- volunteerism22
- workaholisms25
- xerophytisms29